Valence Electrical Training Services

Can You Predict What Happens in a Permissive Under-Reaching Transfer Trip (PUTT) Scheme?

The Relay Testing Handbook: End-to-End Testing covers the most common Communication-Assisted Protection Schemes including the Permissive Under-Reaching Transfer Trip (PUTT) Scheme. This bonus animation shows the steps involved for a PUTT trip.

End-to-end testers should understand how this scheme operates before they test it and this animation was created to help relay testers understand distance relay principles.

Click on the following image to open an animation to see if you can accurately predict what will happen at different fault locations with a Permissive Under-Reaching Transfer Trip (PUTT) Scheme.

Press “What happens Next” to move through the animation.  Press “Move the Fault” to change the fault location.

PermissiveUnder-Reaching Transfer Trip Animation (POTT) demonstration of what can go wrong with POTT schemes

You can watch this animation in action here:

About the Author Chris Werstiuk

Chris is an Electrical Engineering Technologist, a Journeyman Power System Electrician, and a Professional Engineer. He is also the Author of The Relay Testing Handbook series and founder of Valence Electrical Training Services. You can find out more about Chris here.

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